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Catalyst system for synthesizing acetic acid through methanol carbonylation and application of catalyst system

A catalyst and chemical synthesis technology, applied in the direction of physical/chemical process catalyst, organic compound/hydride/coordination complex catalyst, carbon monoxide reaction to prepare carboxylic acid, etc. High cost and other problems, to achieve the effect of high product yield, simple process, and accelerated response speed

Active Publication Date: 2015-06-10
JIANGSU SOPO CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a catalyst system for carbonylation of methanol to synthesize acetic acid, which solves the problems of high production cost, complex production process and many by-products in the prior art by using the catalyst system

Method used

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  • Catalyst system for synthesizing acetic acid through methanol carbonylation and application of catalyst system
  • Catalyst system for synthesizing acetic acid through methanol carbonylation and application of catalyst system
  • Catalyst system for synthesizing acetic acid through methanol carbonylation and application of catalyst system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1-1 Preparation of Lithium Acetate Aqua

[0037] (1) Add 99.9% lithium carbonate to the reaction kettle, add deionized water and stir until viscous, and prepare a lithium carbonate slurry with a mass fraction of 30-35%;

[0038] (2) After the sampling analysis is qualified, open the steam valve, and use the kettle jacket to heat the material in the kettle to 70°C;

[0039] (3) Turn on the fan of the negative pressure system to keep the reactor at a slight negative pressure of 3-5cmH2O;

[0040] (4) Open the acetic acid head tank valve, drip 99.8% acetic acid to react with it, and the rate of addition is the speed that makes the reaction liquid in the still not escape;

[0041] (5) Keep the temperature of steps (3) and (4) at 60°C until the gas no longer escapes, which is the end of the reaction. After the end of the reaction, the material is filtered to remove insoluble impurities to obtain the lithium acetate aqua product.

[0042] 1-2 Synthesis of acetic acid

[00...

Embodiment 2

[0048] 1-1 Preparation of Lithium Acetate Aqua

[0049] (1) Add 99.9% lithium carbonate to the reaction kettle, add deionized water and stir until viscous, and prepare a lithium carbonate slurry with a mass fraction of 30-35%;

[0050] (2) After the sampling analysis is qualified, open the steam valve, and use the kettle jacket to heat the material in the kettle to 70°C;

[0051] (3) Turn on the fan of the negative pressure system to keep the reactor at a slight negative pressure of 3-5cmH2O;

[0052] (4) Open the acetic acid head tank valve, drip 99.8% acetic acid to react with it, and the rate of addition is the speed that makes the reaction liquid in the still not escape;

[0053] (5) Keep the temperature of steps (3) and (4) at 70°C until the gas no longer escapes, which is the end of the reaction. After the end of the reaction, the material is filtered to remove insoluble impurities to obtain the lithium acetate aqua product.

[0054] 1-2 Synthesis of acetic acid

[00...

Embodiment 3

[0059] 1-1 Preparation of Lithium Acetate Aqua

[0060] (1) Add 99.9% lithium carbonate to the reaction kettle, add deionized water and stir until viscous, and prepare a lithium carbonate slurry with a mass fraction of 30-35%;

[0061] (2) After the sampling analysis is qualified, open the steam valve, and use the kettle jacket to heat the material in the kettle to 70°C;

[0062] (3) Turn on the fan of the negative pressure system to keep the reactor at a slight negative pressure of 3-5cmH2O;

[0063] (4) Open the acetic acid head tank valve, drip 99.8% acetic acid to react with it, and the rate of addition is the speed that makes the reaction liquid in the still not escape;

[0064] (5) keep step (3) and (4) temperature at 80 DEG C, until gas no longer escapes and is the end of the reaction, after the end of the reaction, the material is filtered to remove insoluble impurities to obtain the lithium acetate aqua product.

[0065] 1-2 Synthesis of acetic acid

[0066] (1) [R...

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Abstract

The invention belongs to the field of acetic acid preparation realized through methanol carbonylation reaction and particularly relates to a catalyst system for synthesizing acetic acid through methanol carbonylation and application of the catalyst system. The catalyst system for synthesizing acetic acid through methanol carbonylation comprises active rhodium, hydroiodic acid or iodine, methyl iodide, water, a lithium acetate aqueous solution and acetic acid, wherein the mass percentage of active rhodium in the whole reaction system is 800-1000ppm, the content of total iodine in the whole reaction system is 2.8-3.5mol / L, the mass percentage of the lithium acetate aqueous solution in the whole reaction system is 8000-12000ppm, the mass percentage of methyl iodide in the whole reaction system is 8-13%, the mass percentage of the water in the whole reaction system is 2%, and the mass percentage of acetic acid in the whole reaction system is 57-62%. By using the catalyst system, methanol can be converted into acetic acid at high speed and relatively-low pressure, so that the production cost of acetic acid is low, the formula is simple, the production process is easy, and byproducts including CO2, H2 and propionic acid are greatly reduced.

Description

technical field [0001] The invention belongs to the field of methanol carbonylation reaction to prepare acetic acid, and in particular relates to a catalyst system for methanol carbonylation to synthesize acetic acid and its application. Background technique [0002] Acetic acid is an important chemical raw material, mainly used in the production of vinyl acetate monomer, acetic anhydride, terephthalic acid, polyvinyl alcohol, acetates and cellulose acetate. It is widely used in chemical industry, light textile, medicine, dyestuff and other industries, so it has become a hot spot of current research. The choice of catalyst is one of the most important contents in the technology of synthesizing acetic acid from methanol carbonylation to produce acetic acid. In the early 1970s, the invention of a homogeneous rhodium catalyst for oxo synthesis (US3769329) by Paulik et al. from monsanto company opened up a new implementation path for the oxo synthesis process. After continuous...

Claims

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Application Information

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IPC IPC(8): B01J31/30B01J31/22B01J31/28C07C53/08C07C51/12
Inventor 朱桂生邵守言周祖涛唐丽段红宇尹振中
Owner JIANGSU SOPO CHEM
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